This Star is difficult to get because the bombs do not seem to explode fast enough. First, place a bomb on all of the little yellow circles that you shoot to make a coin. This will provide the best blast coverage, so you will need six bombs. When the level starts, long jump the left-most bomb. Take it, run forward a bit, and throw it at the furthest left side yellow dot. Next, long jump back to the second bomb (from the left), and take that bomb. Turn around, and throw it. The bomb should land just about on the left side middle dot. Get the third bomb, and do the same thing. It should land just about on the right side middle dot. Next, take the fourth bomb, and run forward a bit. Throw it at the furthest right side dot. Long jump back to the first bomb again. It should be just barely shooting out another bomb. Take it, and throw it at the closest left side dot. Finally, get the second bomb (from the left), and toss it at the closest right side dot. When you pick up that last bomb, you should have about fourteen seconds remaining on the clock, and must have at least eleven seconds. It is important to take the second bomb for the closest right side dot because it lights when you pick it up. The bomb will already be active while you run to the dot. It is also important to get the bombs as close to the yellow dots as possible and execute all your moves flawlessly (no unnecessary jumps or spins) as every second counts. This will require some practice. You must experiment with how far Mario can throw the bombs. For the left and right furthest dots, try throwing them when you are even with the closest dots.